What is the concentration of chlorophyll B if an absorbance of 1 is measured at 431nm in a cuvette with a pathlength of 1cm. (Chlorophyll B Extinction coefficient: 57.43 mM-1 cm-1)
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- What is the concentration of chlorophyll B if an absorbance of 1 is measured at 431nm in a cuvette with a pathlength of 1cm. (Chlorophyll B Extinction coefficient: 57.43 mM-1 cm-1)
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- if the absorbance of pure chlorophyll a in a 1 cm cell is 0.876 at 530 nm and the concentration is 8.66 x 10^-6 M, what is the molar extinction coefficient of chlorophyll a?We perform our measurements for KHP at 281 nm. Would we get the same results for pathlength at 250 nm? What about using chlorophyll at 667 nm? Why might a too high concentration of KHP give erroneous data for measuring pathlength?What are the peak absorbances of the chlorophyll according to your graph? Does this correlate with your predictions?
- In a photosynthetic investigation, a student measured the following pH of the stroma and the inner thylakoid compartments of spinach leaf cells at the conclusion of the experiment. Source of Fluid pH (mean) Standard Error of Mean (SEM) Stroma 8.2 0.75 Inner compartment of thylakoid 5.6 0.35 b. Construct an appropriately labeled graph to illustrate the sample means of the two locations to within 95% confidence (i.e. sample mean + 2 SEM).can you explain what is happening in the attached graph? Figure 2: Lineweaver-Burke plot of ALP Kinetic parameters.If a plant is removed from its natural environment and exposed to 100 percent CO2 composed of the radioisotope 14C, which of the following will not occur?
- The chemical reaction equation for the conversion of ethanol (C2H5OH) to acetic acid (CH3COOH) is: C2H5OH + O2 → CH3COOH + H2OIn a vinegar production industry, acetic acid is produced from ethanol during the growth of the bacterium Acetobacter aceti, whose cellular composition is CH1,8O0,5N0,2. The biomass yield from substrate is 0.14 g/g, while the product yield also from substrate is 0.92 g/g. Ammonia is used as a nitrogen source. Based on this information, answer: (a) What is the oxygen demand for acetic acid production in this crop?(b) What are the cooling requirements of a bioreactor containing 3000 L of ethanol (ρ = 789 kg/m³), to be completely converted into acetic acid?Briefly explain why the 14C/12C ratio will decrease after the death of plants. A three- to four-sentence explanation is needed.The graph above illustrates the absorption spectrum of chlorophyll a ONLY. Which colors of the visible light spectrum are absorbed best by chlorophyll a?
- You label CO2 with radiolabeled 18O. After exposure of a plant adapted to a hot, dry climate to the radiolabeled CO2, in what molecule does the radiolabeled 18O appear?Describe the effect of photooxidation on the redox reactions summarized in the Z-scheme.The empirical rate law determined for the decomposition of ozone into molecular oxygen is:2O3(g) → 3O2(g) v = kmeas*[O3]2/[O2]The proposed mechanism can be described with the following equations:O3 −→ O+O2 v1 = k1[O3]O+O2 −→ O3 v2 = k2[O][O2]O+O3 −→ 2O2 v3 = k3[O][O3]Identify the intermediate species and using the steady-state approximation express the rate law belonging to the mechanism! What conditions must be satisfied for the expression to match the experimentally determined rate law? What is kmeas?